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Microchip Technology MIC2125YML-TR
- Part No.:
- MIC2125YML-TR
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MIC2125YML-TR.pdf
- Description:
- IC REG CTRLR BUCK 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,667
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Product details
Overview
MIC2125YML-TR from Microchip Technology is a constant-frequency synchronous buck controller with adaptive ON-time control architecture, designed for high-input-to-low-output voltage conversion (VIN = 4.5V–28V, VOUT = 0.6V–24V). It delivers up to 25A load current, features HyperLight Load® operation for high light-load efficiency, supports programmable switching frequency (200–750 kHz), and integrates enable input, power-good output, and internal 5V LDO for single-supply operation - ideal for telecom base station DC/DC stages.
For engineers reviewing the MIC2125YML-TR datasheet, MIC2125YML-TR pinout, MIC2125YML-TR application, or MIC2125YML-TR equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specs (±1% FB reference, 7 ms soft-start, –40°C to +125°C TJ), and real-world alternative part comparisons - all grounded in Microchip's DS20005459B documentation.
Technical Context
The MIC2125YML-TR implements adaptive ON-time control to maintain constant switching frequency while enabling ultra-fast transient response and stable operation across wide VIN–VOUT differentials (e.g., 28V → 0.6V). Its control loop uses a transconductance error amplifier referenced to a 0.6V internal VREF and triggers ON-time based on feedback voltage deviation - not inductor current sensing.
Unlike current-mode controllers, it senses output voltage ripple to initiate regulation cycles and requires ≥20 mV FB ripple for stability; ripple injection is mandatory with low-ESR capacitors. The MIC2125YML-TR operates in discontinuous conduction mode (DCM) under light load via zero-crossing detection at SW, reducing quiescent current to 340 µA typical while maintaining fast wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports industrial and telecom rails including 12V, 24V, and 28V intermediate bus systems. |
| Output Voltage Range | 0.6V to 24V - adjustable via external resistor divider; ±1% reference accuracy ensures tight regulation at low-VOUT CPU/GPU cores. |
| Switching Frequency | 200 kHz to 750 kHz - programmable via FREQ pin resistor divider; higher frequencies reduce output filter size but increase switching loss. |
| Quiescent Supply Current | 340 µA typical (MIC2125) - enables high efficiency at light loads without external bias supply. |
| Junction Temperature Range | –40°C to +125°C - qualified for harsh environments including base station power modules and industrial PLCs. |
| Package | 16-pin 3 mm × 3 mm QFN (ML) - thermally enhanced exposed pad (EP) with θJA = 50.8°C/W for high-power density layouts. |
| Protection Features | Hiccup-mode short-circuit protection, thermal shutdown (150°C), UVLO (4.2V VDD threshold), and safe start-up into prebiased outputs. |
Pinout & Package
Package: 16-pin, 3 mm × 3 mm QFN (ML) with exposed thermal pad (EP), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Internal 5V LDO output | Supplies control circuitry; bypass with 4.7 µF ceramic to AGND; tie to VIN if VIN < 5.5V to bypass regulator. |
| PVDD | Low-side gate driver supply | Drives DL output; connect to VDD externally; decouple with 4.7 µF ceramic to PGND. |
| ILIM | Current limit programming input | Sets overcurrent threshold by resistor from SW; enables precise ICL adjustment using MOSFET RDS(ON). |
| DL | Low-side N-MOSFET gate driver | Swings 0V to VDD; drives source of external low-side FET; Kelvin-connected to SW for accurate current sensing. |
| PGND | Power ground return | Return path for DL driver; must connect directly to low-side MOSFET source to minimize noise coupling. |
| FREQ | Switching frequency adjust | Resistor divider from VIN to GND sets fSW; tie to VIN for 750 kHz max frequency. |
| DH | High-side N-MOSFET gate driver | Floating output referenced to SW node; requires BST capacitor (≥0.1 µF) for bootstrap operation. |
| SW | Switch node / current sense | Connects to external buck switch node; senses low-side RDS(ON) during OFF time for current limiting. |
| BST | Bootstrap capacitor input | Connect 0.1 µF ceramic between BST and SW; critical for sustaining DH drive voltage during high-duty cycles. |
| OVP | Overvoltage protection input | Resistive divider from VOUT to AGND sets OVP threshold (0.62V internal comparator); tie to AGND to disable. |
| NC | No connect | Pin 11 is unconnected internally; leave floating or ground per layout best practice. |
| AGND | Analog ground reference | Reference for FB, EN, PG, OVP; connect to EP and system analog ground plane for noise immunity. |
| FB | Feedback input | Regulated to 0.6V ±1%; sets VOUT via resistive divider; requires ≥20 mV ripple for stable adaptive ON-time operation. |
| PG | Open-drain power-good output | Asserts high when VOUT is within 85–95% of target; requires external pull-up to VDD or system rail. |
| EN | Enable logic input | Active-high (≥1.6V); shuts down IC with 0.1 µA quiescent current; do not pull up to VDD/PVDD. |
| VIN | Main power input | 4.5V–28V supply; requires 1 µF ceramic decoupling to AGND close to pin. |
| EP | Exposed thermal pad | Must be soldered to AGND copper pour; primary thermal path for θJC = 25.3°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| HyperLight Load® architecture | Enables DCM operation at light loads with 340 µA quiescent current - maintains >85% efficiency at 1% load in 12V→1.2V designs. |
| Adaptive ON-time control | Delivers constant fSW without external compensation; achieves <50 µs output recovery from 2A→12A transients in typical layouts. |
| Any Capacitor™ stability | Supports ceramic, polymer, and electrolytic output caps without external type-specific compensation - reduces BOM count. |
| Safe start-up into prebiased output | Prevents reverse current flow during hot-insertion; allows reliable power sequencing in distributed systems with shared VOUT rails. |
| Programmable hiccup-mode protection | Triggers after eight consecutive current-limit events; limits fault energy and prevents thermal runaway during sustained shorts. |
Applications
| Telecom Base Station Power | Industrial Distributed Power |
|---|---|
|
Use Scenario: Point-of-load regulation in 28V intermediate bus systems powering RF amplifiers and FPGAs. IC Role / Device Role / Timing Role: Synchronous buck controller managing 25A peak load with adaptive ON-time for dynamic core voltage scaling. Use Value: Enables 0.6V output at ±1% accuracy with 750 kHz switching - shrinking output filter size by 40% vs. 300 kHz alternatives. |
Use Scenario: Isolated DC/DC front-end supplying 12V/20A to PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Primary controller driving external high-side/low-side MOSFETs with integrated 5V LDO for gate bias. Use Value: Eliminates need for auxiliary bias supply; 340 µA light-load IQ extends standby runtime in energy-conscious systems. |
| Server VR13-Compatible PSU | Networking Switch ASIC Supply |
|
Use Scenario: Core voltage regulation for Xeon-class processors requiring fast transient response and tight VOUT tolerance. IC Role / Device Role / Timing Role: Adaptive ON-time buck controller delivering 1.0V/20A with programmable soft-start and PG signaling. Use Value: 7 ms internal soft-start prevents inrush-induced rail collapse; PG output synchronizes downstream logic sequencing. |
Use Scenario: Dual-rail supply (1.2V/1.8V) for multi-gigabit Ethernet PHYs and packet processors in enterprise switches. IC Role / Device Role / Timing Role: High-efficiency buck controller supporting multiple independent outputs via parallel configurations. Use Value: HyperLight Load® extends efficiency >90% down to 0.5A load - critical for low-traffic port sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Fixed 600 kHz fSW; no FREQ pin; integrated MOSFETs (30V/15A); lacks ILIM programming and OVP input. | Targeted at space-constrained, lower-current (≤15A) applications where discrete FET selection is undesirable. | Select MP2918GQ-Z only when board area is critical and 15A max output suffices; MIC2125YML-TR offers superior flexibility for 25A+ and custom FET optimization. |
| LTC3891EUF#PBF | Wide VIN (4–60V); dual-phase capable; requires external compensation; no integrated LDO; higher IQ (1.2 mA). | Designed for high-reliability automotive and industrial systems needing extended input range and phase interleaving. | Choose LTC3891EUF#PBF for 60V input capability or multiphase scalability; MIC2125YML-TR excels in cost-sensitive telecom 28V bus designs with simpler layout. |
Compared with MP2918GQ-Z and LTC3891EUF#PBF, the MIC2125YML-TR uniquely balances programmable frequency, discrete FET control, integrated 5V LDO, and HyperLight Load® efficiency - making it optimal for mid-power telecom and industrial buck converters where design flexibility and light-load performance are prioritized.
Availability
MIC2125YML-TR is available at Aetrix Electronics and suitable for telecom base stations, industrial PLCs, and server power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for MIC2125YML-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and embedded system integration.
The MIC2125YML-TR belongs to Microchip's high-voltage synchronous buck controller product line, engineered specifically for efficient, flexible, and robust DC/DC conversion in networking, telecom, and industrial power systems.
FAQ
What is the maximum supported output current for the MIC2125YML-TR?
The MIC2125YML-TR is rated to support up to 25A load current when paired with appropriately selected external high-side and low-side MOSFETs, proper PCB layout, and adequate thermal management - as confirmed in Microchip's DS20005459B, page 1. Its current limit is programmable via the ILIM pin and low-side RDS(ON) sensing, enabling precise tailoring to the chosen FETs' characteristics.
Does the MIC2125YML-TR require external compensation components?
No, the MIC2125YML-TR features internal compensation as stated in its General Description (DS20005459B, page 1). Its adaptive ON-time control architecture eliminates the need for external Type-II or Type-III compensation networks - simplifying design and reducing component count compared to traditional voltage-mode or current-mode controllers.
Can the MIC2125YML-TR safely start up into a prebiased output voltage?
Yes, the MIC2125YML-TR explicitly supports safe start-up into a prebiased output, as documented in the Features list and Functional Description (DS20005459B, pages 1 and 17). This prevents reverse current flow and ensures controlled ramp-up even when VOUT is already partially charged - essential for hot-swap and redundant power architectures.
What is the purpose of the BST pin on the MIC2125YML-TR?
The BST pin on the MIC2125YML-TR is the bootstrap capacitor input for the high-side gate driver. A minimum 0.1 µF ceramic capacitor must be placed between BST and SW to provide the floating voltage required to fully enhance the external high-side N-channel MOSFET - a critical requirement for proper high-side switching operation in buck topologies.
How does the MIC2125YML-TR achieve high efficiency at light loads?
The MIC2125YML-TR achieves high light-load efficiency through its HyperLight Load® architecture, which transitions into discontinuous conduction mode (DCM) and disables non-essential circuits. This reduces quiescent supply current to 340 µA typical (DS20005459B, Table 1-1), while maintaining fast wake-up and regulation - a key advantage over fixed-frequency controllers that suffer efficiency roll-off below 10% load.
MIC2125YML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- HyperLight Load®
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 28V
- Frequency - Switching:
- 200kHz ~ 750kHz
- Duty Cycle (Max):
- 85%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MIC2125YML-TR FAQ
1.How can I place an order for MIC2125YML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2125YML-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MIC2125YML-TR reliable?
The price and inventory of MIC2125YML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2125YML-TR is usually 5 days.
3.What payment methods are accepted for MIC2125YML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2125YML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2125YML-TR?
MIC2125YML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2125YML-TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MIC2125YML-TR?
For technical support, including MIC2125YML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2125YML-TR requirements.
6.How does Aetrix verify that MIC2125YML-TR is sourced from the original manufacturer or authorized distributors?
All MIC2125YML-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC2125YML-TR meets industry standards.
7.What is the process for return or replacement of MIC2125YML-TR?
All MIC2125YML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2125YML-TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MIC2125YML-TR part is unused and in its original packaging.
Return procedure for MIC2125YML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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